export {};

//元组 特殊的数组    ?  可选项目
let person: [string, number, number?];

person = ["张三", 18, 888];
person = ["李四", 28, 888];
person = ["王五", 28];
// person = ["李四", 28, 888, 54654];
// person = [18, 28, 888];

// let user:tuple
let name: string;
